Amnesty International Researcher Kate Schuetze has told Radio Australia's Pacific Beat the ruling has left open the possibility of a challenge on the basis of an unreasonable delay in processing asylum seekers or resettling refugees once assessed.

"In the future we may see that if they're held there too long in those restrictive conditions, the court then may determine that form of lengthy and restrictive detention is against Nauru law," Ms Schuetze said.

"There are responsibilities on the Nauru government following the decision to make sure they meet those standards under their own domestic laws and promptly process the asylum seekers who are detained there."

Ms Schuetze says Amnesty will continue to urge the Australian government to abandon offshore processing and encourage Nauru's government to meet its responsibilities to asylum seekers sent to the processing centre.